Australian Open champion Jannik Sinner recovered from a set down to beat Tallon Griekspoor, while Daniil Medvedev and Casper Ruud also advanced at the Miami Open.
Australia ended the surprise run of Finland to reach the Davis Cup final for the second year in a row.
Despite her impending departure from the position of Proteas head coach in December, Norma Plummer identifies positive developments within her team.
The Proteas aim to close the distance between themselves and Australia, the top-ranked team in world netball as they head into their second test match.